Quick answer
The Sigma 18-50mm f/2.8-4.5 DC OS HSM is a ultra-wide to standard zoom lens covering 18-50mm at f/2.8 for the Sigma SA mount. Its bright maximum aperture handles indoor and evening light reasonably well.
About this lens
A 18-50mm f/2.8-4.5 APS-C standard zoom lens, the Sigma 18-50mm f/2.8-4.5 DC OS HSM is designed for Sigma SA mount bodies, with Optical Stabilizer and Hyper Sonic Motor autofocus. The range covers everything from wide scenes to portraits, so it works as a general-purpose lens.
Sigma 18-50mm f/2.8-4.5 DC OS HSM specifications
- Brand
- Sigma
- Mount
- Sigma SA
- Focal length
- 18-50mm
- Maximum aperture
- f/2.8
- Lens type
- Zoom
- Optical construction
- 16 elements in 12 groups
- Aperture blades
- 7
- Minimum focus distance
- 0.3 m
- Maximum magnification
- 0.25x
- Filter thread
- 67 mm
Specification source: dyxum.com
What can you shoot with the Sigma 18-50mm f/2.8-4.5 DC OS HSM?
At 18-50mm this is a ultra-wide to standard zoom, which typically suits:
- Landscapes and big skies
- Architecture and interiors
- Astrophotography and night skies
- Landscapes and cityscapes
- Street and travel photography
Its bright maximum aperture handles indoor and evening light reasonably well.
Full-frame equivalent and field of view
Calculated from the focal length and crop factor. Not measured.
| Sensor | Crop | Equivalent | Horizontal FOV | Diagonal FOV |
|---|---|---|---|---|
| Full frame | 1.0x | 18–50mm | 39.6–90° | 46.8–100.5° |
| APS-C | 1.5x | 27–75mm | 27–67.4° | 32.2–77.4° |
Frequently asked questions
What mount does the Sigma 18-50mm f/2.8-4.5 DC OS HSM use?
It uses the Sigma SA mount, so it fits Sigma SA cameras directly.
What is the focal length of the Sigma 18-50mm f/2.8-4.5 DC OS HSM?
It zooms across 18-50mm with a maximum aperture of f/2.8. That makes it a ultra-wide to standard lens.
Is the Sigma 18-50mm f/2.8-4.5 DC OS HSM a prime or a zoom lens?
It is a zoom lens covering 18-50mm, so you can reframe without moving. Its maximum aperture is f/2.8.
What is the Sigma 18-50mm f/2.8-4.5 DC OS HSM equivalent on a crop sensor?
On APS-C (1.5x crop) it frames like 27–75mm on full frame, with a 27–67.4° horizontal and 32.2–77.4° diagonal field of view. These figures are calculated from the focal length and crop factor.
More Sigma lenses for Sigma SA
All Sigma lenses
Other 18-50mm lenses
Browse by focal length: 18mm lenses, 50mm lenses